/// <summary>
/// A callback function which will be called every time a mouse activity detected.
/// </summary>
/// <param name="nCode">
/// [in] Specifies whether the hook procedure must process the message.
/// If nCode is HC_ACTION, the hook procedure must process the message.
/// If nCode is less than zero, the hook procedure must pass the message to the
/// CallNextHookEx function without further processing and must return the
/// value returned by CallNextHookEx.
/// </param>
/// <param name="wParam">
/// [in] Specifies whether the message was sent by the current thread.
/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
/// </param>
/// <param name="lParam">
/// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
/// </param>
/// <returns>
/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
/// procedure does not call CallNextHookEx, the return value should be zero.
/// </returns>
private int MouseHookProc(int nCode, UIntPtr wParam, IntPtr lParam)
{
// if ok and someone listens to our events
if ((nCode >= 0) && (MouseActivity != null))
{
//Marshall the data from callback.
var mouseHookStruct = (MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(MSLLHOOKSTRUCT));
//detect button clicked
var button = MouseButtons.None;
short mouseDelta = 0;
switch ((WM)wParam)
{
case WM.LBUTTONDOWN:
//case WM_LBUTTONUP:
//case WM_LBUTTONDBLCLK:
button = MouseButtons.Left;
break;
case WM.RBUTTONDOWN:
//case WM_RBUTTONUP:
//case WM_RBUTTONDBLCLK:
button = MouseButtons.Right;
break;
case WM.MOUSEWHEEL:
//If the message is WM_MOUSEWHEEL, the high-order word of mouseData member is the wheel delta.
//One wheel click is defined as WHEEL_DELTA, which is 120.
//(value >> 16) & 0xffff; retrieves the high-order word from the specified 32-bit value
mouseDelta = (short)((mouseHookStruct.mouseData >> 16) & 0xffff);
//TODO: X BUTTONS
//If the message is WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP,
//or WM_NCXBUTTONDBLCLK, the high-order word specifies which X button was pressed or released,
//and the low-order word is reserved. This value can be one or more of the following values.
//Otherwise, mouseData is not used.
break;
}
//double clicks
var clickCount = 0;
if (button != MouseButtons.None)
{
if ((WM)wParam == WM.LBUTTONDBLCLK || (WM)wParam == WM.RBUTTONDBLCLK)
{
clickCount = 2;
}
else
{
clickCount = 1;
}
}
//generate event
var e = new MouseEventArgs(button, clickCount, mouseHookStruct.pt.x, mouseHookStruct.pt.y, mouseDelta);
//raise it
MouseActivity(this, e);
}
//call next hook
return(USER32.CallNextHookEx(hMouseHook, nCode, wParam, lParam));
}
/// <summary>
/// A callback function which will be called every time a keyboard activity detected.
/// </summary>
/// <param name="nCode">
/// [in] Specifies whether the hook procedure must process the message.
/// If nCode is HC_ACTION, the hook procedure must process the message.
/// If nCode is less than zero, the hook procedure must pass the message to the
/// CallNextHookEx function without further processing and must return the
/// value returned by CallNextHookEx.
/// </param>
/// <param name="wParam">
/// [in] Specifies whether the message was sent by the current thread.
/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
/// </param>
/// <param name="lParam">
/// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
/// </param>
/// <returns>
/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
/// procedure does not call CallNextHookEx, the return value should be zero.
/// </returns>
private int KeyboardHookProc(int nCode, UIntPtr wParam, IntPtr lParam)
{
//indicates if any of underlaing events set e.Handled flag
var handled = false;
//it was ok and someone listens to events
if ((nCode >= 0) && (KeyDown != null || KeyUp != null || KeyPress != null))
{
//read structure KeyboardHookStruct at lParam
var keyboardHookStruct = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure((IntPtr)lParam, typeof(KBDLLHOOKSTRUCT));
//raise KeyDown
if (KeyDown != null && ((WM)wParam == WM.KEYDOWN || (WM)wParam == WM.SYSKEYDOWN))
{
var keyData = (Keys)keyboardHookStruct.vkCode;
var e = new KeyEventArgs(keyData);
KeyDown(this, e);
handled |= e.Handled;
}
// raise KeyPress
if (KeyPress != null && (WM)wParam == WM.KEYDOWN)
{
var isDownShift = ((USER32.GetKeyState((int)VK.SHIFT) & 0x80) == 0x80);
var isDownCapslock = (USER32.GetKeyState((int)VK.CAPITAL) != 0);
var keyState = new byte[256];
USER32.GetKeyboardState(keyState).ThrowOnError();
var inBuffer = new byte[2];
if (USER32.ToAscii(keyboardHookStruct.vkCode, keyboardHookStruct.scanCode, keyState, inBuffer, keyboardHookStruct.flags) == 1)
{
var key = (char)inBuffer[0];
if ((isDownCapslock ^ isDownShift) && char.IsLetter(key))
{
key = char.ToUpper(key);
}
var e = new KeyPressEventArgs(key);
KeyPress(this, e);
handled |= e.Handled;
}
}
// raise KeyUp
if (KeyUp != null && ((WM)wParam == WM.KEYUP || (WM)wParam == WM.SYSKEYUP))
{
var keyData = (Keys)keyboardHookStruct.vkCode;
var e = new KeyEventArgs(keyData);
KeyUp(this, e);
handled |= e.Handled;
}
}
//if event handled in application do not handoff to other listeners
if (handled)
{
return(1);
}
else
{
return(USER32.CallNextHookEx(hKeyboardHook, nCode, wParam, lParam));
}
}